7.Anobjectisplacedonametrescaleat8cmmarkwasfocusedonawhite
screenplacedat92cmmark,usingaconverginglensplacedonthescaleat
50cmmark.
(i)Findthefocallengthoftheconverginglens.
(ii)Findthepositionoftheimageformediftheobjectisshiftedtowardsthelens
atapositionof29.0cm.
(iii)Statethenatureoftheimageformediftheobjectisfurthershiftedtowards
thelens
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